Interface - Syntax Error On Token Default

I am following this article : [URL] ....

And I have created 4 different types of Interfaces and Classes

Interface:-Flyer,Mythical
Class:-Horse,Pegasys.

But on Interface

I am getting error on line

default public String identifyMyself()
"Syntax error on token "default" delete this token"

Here is code for all 4 interfaces and classes

public class Horse {
public String identifyMyself() {
return "I am a horse.";
}
}
public interface Flyer {
default public String identifyMyself() {

[Code] ....